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Gauge dependence and renormalization of tanβ in the MSSM

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arxiv hep-ph/0205281 v4 pith:XGE4VOOD submitted 2002-05-24 hep-ph

Gauge dependence and renormalization of tanβ in the MSSM

classification hep-ph
keywords betarenormalizationgaugeindependenceschemeschemesthreeanalyzed
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Well-known and newly developed renormalization schemes for $\tan\beta$ are analyzed in view of three desirable properties: gauge independence, process independence, and numerical stability in perturbation theory. Arguments are provided that no scheme can meet all three requirements, and as an illustration, a ``No-Go-Theorem'' for the renormalization of $\tan\beta$ is established. Nevertheless, two particularly attractive schemes emerge. A discussion about which scheme might be the best compromise in practice is given.

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